Tender For supply of testo make online dew point transmitter 6681 , testo make sensor/probe 6610 series suitable for transmitter 6681 along with 3 point calibration cer , retractable ball valve assembly suitable for testo probe/sensor 6615 and 50nb pipe size , extension cable of length 10 meter suitable for testo probe 6615 , sintered ss filter cap suitable for testo probe 6615